291 lines
9.1 KiB
Scheme
291 lines
9.1 KiB
Scheme
;;; Ikarus Scheme -- A compiler for R6RS Scheme.
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;;; Copyright (C) 2008,2009 Abdulaziz Ghuloum
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;;;
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;;; This program is free software: you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License version 3 as
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;;; published by the Free Software Foundation.
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;;;
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;;; This program is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(library (ypsilon-compat)
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(export on-windows on-darwin on-linux on-freebsd on-posix
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load-shared-object c-argument c-function
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microsecond usleep library-pointer
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(rename (ypsilon:format format)))
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(import
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(ikarus system $foreign)
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(except (ikarus) library))
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(define (microsecond)
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(let ([t (current-time)])
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(+ (* (time-second t) 1000000)
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(div (time-nanosecond t) 1000))))
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(define (usleep . args) (error '#f "invalid args" args))
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(define (ypsilon:format what str . args)
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(cond
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[(eq? what #t)
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(apply printf str args)]
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[(eq? what #f)
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(apply format str args)]
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[else (error 'ypsion:format "invalid what" what)]))
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(define (architecture-feature what)
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(case what
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[(operating-system) (host-info)]
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[else (error 'architecture-feature "invalid args" what)]))
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(define (string-contains text s)
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(define (starts-at? i)
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(let f ([i i] [j 0])
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(cond
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[(= j (string-length s)) #t]
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[(= i (string-length text)) #f]
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[else
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(and (char=? (string-ref text i) (string-ref s j))
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(f (+ i 1) (+ j 1)))])))
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(let f ([i 0])
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(cond
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[(= i (string-length text)) #f]
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[(starts-at? i) #t]
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[else (f (+ i 1))])))
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(define on-windows (and (string-contains (architecture-feature 'operating-system) "windows") #t))
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(define on-darwin (and (string-contains (architecture-feature 'operating-system) "darwin") #t))
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(define on-linux (and (string-contains (architecture-feature 'operating-system) "linux") #t))
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(define on-freebsd (and (string-contains (architecture-feature 'operating-system) "freebsd") #t))
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(define on-posix (not on-windows))
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(define-record-type library (fields name pointer))
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(define (load-shared-object libname)
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(unless (string? libname)
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(error 'load-shared-object "library name must be a string"
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libname))
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(make-library libname
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(or (dlopen libname)
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(error 'load-shared-object (dlerror) libname))))
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(define (int? x) (or (fixnum? x) (bignum? x)))
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(define (check-int who x)
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(cond
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[(int? x) x]
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[else (die who "not an int" x)]))
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(define (vector-andmap f v)
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(andmap f (vector->list v)))
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(define (check-int* who x)
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(cond
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[(and (vector? x) (vector-andmap int? x))
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(let ([n (vector-length x)])
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(let ([p (malloc (* n 4))])
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(let f ([i 0])
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(cond
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[(= i n) p]
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[else
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(pointer-set-c-int! p (* i 4) (vector-ref x i))
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(f (+ i 1))]))))]
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[else (die who "not an int*" x)]))
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(define (check-char* who x)
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(cond
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[(string? x)
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(check-byte* who (string->utf8 x))]
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[else (die who "not a char*" x)]))
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(define pointer-size
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(cond
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[(<= (fixnum-width) 32) 4]
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[else 8]))
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(define (check-char** who x)
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(cond
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[(and (vector? x) (vector-andmap string? x))
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(let ([n (vector-length x)])
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(let ([p (malloc (* n pointer-size))])
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(let f ([i 0])
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(cond
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[(= i n) p]
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[else
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(pointer-set-c-int! p (* i pointer-size)
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(pointer->integer (check-char* who (vector-ref x i))))
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(f (+ i 1))]))))]
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[else (die who "not a char**" x)]))
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(define (check-byte* who x)
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(cond
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[(bytevector? x)
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(let ([n (bytevector-length x)])
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(let ([p (malloc (+ n 1))])
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(pointer-set-c-char! p n 0)
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(let f ([i 0])
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(cond
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[(= i n) p]
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[else
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(pointer-set-c-char! p i (bytevector-u8-ref x i))
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(f (+ i 1))]))))]
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[else (die who "not a byte*" x)]))
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(define (check-float who x)
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(cond
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[(flonum? x) x]
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[else (die who "not a flonum" x)]))
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(define (check-double who x)
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(cond
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[(flonum? x) x]
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[else (die who "not a double" x)]))
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(define-syntax check-callback
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(lambda (x)
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(syntax-case x ()
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[(_ foreign-name val return-type (arg-type* ...))
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#'(let ([t val])
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(if (procedure? t)
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((make-c-callback
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(convert-type return-type)
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(list (convert-type arg-type*) ...))
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t)
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(error 'foreign-name "not a procedure" t)))])))
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(define-syntax todo
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(syntax-rules ()
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[(_ name* ...)
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(begin
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(define (name* . args) (error 'name* "not implemented"))
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...)]))
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(define (check-void* who x)
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(cond
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[(pointer? x) x]
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[else (die who "not a void*" x)]))
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(define-syntax convert-arg
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(lambda (x)
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(syntax-case x (int char* byte* c-callback float double void*)
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[(_ form foreign-name val char*)
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#'(check-char* 'foreign-name val)]
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[(_ form foreign-name val byte*)
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#'(check-byte* 'foreign-name val)]
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[(_ form foreign-name val void*)
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#'(check-void* 'foreign-name val)]
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[(_ form foreign-name val int)
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#'(check-int 'foreign-name val)]
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[(_ form foreign-name val float)
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#'(check-float 'foreign-name val)]
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[(_ form foreign-name val double)
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#'(check-double 'foreign-name val)]
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[(_ form foreign-name val [int])
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#'(check-int* 'foreign-name val)]
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[(_ form foreign-name val [char*])
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#'(check-char** 'foreign-name val)]
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[(_ form foreign-name val [c-callback return-type (arg-types ...)])
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#'(check-callback foreign-name val return-type (arg-types ...))]
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[(_ form foreign-name val arg-type)
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(syntax-violation 'c-function "invalid argument type"
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#'form #'arg-type)])))
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(define (char*->string who x)
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(define (strlen x)
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(let f ([i 0])
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(cond
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[(= 0 (pointer-ref-c-unsigned-char x i)) i]
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[else (f (+ i 1))])))
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(let ([n (strlen x)])
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(let ([s (make-string n)])
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(let f ([i 0])
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(if (= i n)
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s
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(begin
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(string-set! s i
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(integer->char (pointer-ref-c-unsigned-char x i)))
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(f (+ i 1))))))))
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(define-syntax convert-return
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(lambda (x)
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(syntax-case x (char*)
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[(_ form foreign-name val char*)
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#'(char*->string 'foreign-name val)]
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[(_ form foreign-name val other)
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#'val])))
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(define-syntax convert-type
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(lambda (x)
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(define ls
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'([void void]
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[char* pointer]
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[float float]
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[double double]
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[void* pointer]
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[byte* pointer]
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[int signed-int]))
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(define (valid x)
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(cond
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[(and (list? x) (= (length x) 3) (eq? (car x) 'c-callback))
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(and (valid (cadr x))
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(andmap valid (caddr x))
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'pointer)]
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[(list? x)
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(and (andmap valid x) 'pointer)]
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[(assq x ls) => cadr]
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[else #f]))
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(syntax-case x (void)
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[(ctxt t)
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(cond
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[(valid (syntax->datum #'t)) =>
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(lambda (t)
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(with-syntax ([t (datum->syntax #'ctxt t)])
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#'(quote t)))]
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[else (syntax-violation #f "invalid type" #'t)])])))
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(define (lookup-shared-object lib name)
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(define who 'lookup-shared-object)
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(unless (symbol? name) (die who "not a symbol" name))
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(unless (library? lib) (die who "not a library" lib))
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(or (dlsym (library-pointer lib) (symbol->string name))
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(error who
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(format "cannot find object ~a in library ~a"
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name (library-name lib)))))
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(define-syntax c-function
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(lambda (x)
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(syntax-case x ()
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[(_ lib lib-name return-type conv foreign-name (arg-type* ...))
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(with-syntax ([x x]
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[(t* ...) (generate-temporaries #'(arg-type* ...))])
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#'(let ([callout
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((make-c-callout
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(convert-type return-type)
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(list (convert-type arg-type*) ...))
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(lookup-shared-object lib 'foreign-name))])
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(lambda (t* ...)
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(let ([t* (convert-arg x foreign-name t* arg-type*)] ...)
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(let ([v (callout t* ...)])
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(convert-return x foreign-name v return-type))))))])))
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(define-syntax c-argument
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(lambda (x)
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(syntax-case x ()
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[(_ function-name argnum argtype argval)
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(begin
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;(printf "syntax ~s\n" (syntax->datum x))
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#'(void))])))
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)
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